It could be that conditions or disease's in your enviorment make you more susceptible because you are constantly in that enviorment so it makes you more of a target to new disease's that may occour
I would honestly say greens and fruits and to try to stay away from grease because grease can make you fell gross. Like fresh veggies, fruits, fish and chicken are always good and green tea and water.
There are three major classes of macronutrients: carbohydrates, lipids, and proteins. All three of these nutrients are needed in relatively large amounts AND they contain Calories (note the capital C which indicates kilocalories) which can be "burned" in your body to create energy for your body
